Comparison of contrast ratio, translucency parameter, and flexural strength of traditional and "augmented translucency" zirconia for CEREC CAD/CAM system

Alessandro Vichi; Maurizio Sedda; Riccardo Fabian Fonzar; Michele Carrabba; Marco Ferrari

doi:10.1111/jerd.12172

Comparison of contrast ratio, translucency parameter, and flexural strength of traditional and "augmented translucency" zirconia for CEREC CAD/CAM system

Alessandro Vichi^*, Maurizio Sedda, Riccardo Fabian Fonzar, Michele Carrabba, Marco Ferrari

^*Corresponding author for this work

University of Portsmouth Dental Academy

Research output: Contribution to journal › Article › peer-review

Abstract

Purpose: Tetragonal zirconia polycrystals (TZP) can be used via CAD/CAM technique as metal replacement for fixed partial dentures. However, its intense white color and high opacity may represent an aesthetic limit. New TZPs with a claimed higher degree of translucency were recently marketed. The aim of the study was to investigate contrast ratio (CR), translucency parameter (TP), flexural strength (σ), Weibull characteristic strength (σ₀), and Weibull modulus (m) of three "traditional" (IPS e.max Zir-CAD, inCoris ZI, VITA In-Ceram YZ) and two "increased translucency" (inCoris TZI, VITA In-Ceram YZ HT) Y-TZPs.

Methods: For flexural strength, ISO 6872:2008 was followed. Bars (N = 40) were cut from pre-sintered blocks. Dense-sintering, finishing, and polishing were performed in order to obtain specimens of 15 × 4 × 1.2 mm. Samples were tested with three-point bending setup in a universal testing machine. For CR and TP, specimens (N = 10) were cut perpendicularly to the long axis from pre-sintered blocks. After the dense-sintering, specimens were finished and polished in order to obtain tiles of 12 × 15 × 1 mm. CR and TP were measured with a spectrophotometer equipped with an integrating sphere.

Results: No significant difference was found regarding flexural strength. A significant difference was found both for CR and TP among tested groups. VITA In-Ceram YZ HT and inCoris TZI showed the higher translucency. The difference was not statistically significant when compared with VITA In-Ceram YZ, and statistically significant when compared with IPS e.max Zir-CAD and inCoris ZI.

Conclusion: The new "augmented translucency" TZPs showed higher translucency and similar flexural strength than "traditional" TZPs.

Clinical Significance: Monolithic zirconia use is partially restricted due to the zirconia low translucency. The new "augmented translucency" zirconia showed a modest but perceptible increase in translucency and a similar flexural resistance, thus increasing the clinically suitable thickness range with optimized aesthetic and resistance.

Original language	English
Pages (from-to)	S32-S39
Number of pages	8
Journal	Journal of Esthetic and Restorative Dentistry
Volume	28
Issue number	S1
Early online date	17 Nov 2015
DOIs	https://doi.org/10.1111/jerd.12172
Publication status	Published - 26 Apr 2016

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10.1111/jerd.12172

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@article{c073def5875141079f577db64c252487,

title = "Comparison of contrast ratio, translucency parameter, and flexural strength of traditional and {"}augmented translucency{"} zirconia for CEREC CAD/CAM system",

abstract = "Purpose: Tetragonal zirconia polycrystals (TZP) can be used via CAD/CAM technique as metal replacement for fixed partial dentures. However, its intense white color and high opacity may represent an aesthetic limit. New TZPs with a claimed higher degree of translucency were recently marketed. The aim of the study was to investigate contrast ratio (CR), translucency parameter (TP), flexural strength (σ), Weibull characteristic strength (σ0), and Weibull modulus (m) of three {"}traditional{"} (IPS e.max Zir-CAD, inCoris ZI, VITA In-Ceram YZ) and two {"}increased translucency{"} (inCoris TZI, VITA In-Ceram YZ HT) Y-TZPs. Methods: For flexural strength, ISO 6872:2008 was followed. Bars (N = 40) were cut from pre-sintered blocks. Dense-sintering, finishing, and polishing were performed in order to obtain specimens of 15 × 4 × 1.2 mm. Samples were tested with three-point bending setup in a universal testing machine. For CR and TP, specimens (N = 10) were cut perpendicularly to the long axis from pre-sintered blocks. After the dense-sintering, specimens were finished and polished in order to obtain tiles of 12 × 15 × 1 mm. CR and TP were measured with a spectrophotometer equipped with an integrating sphere. Results: No significant difference was found regarding flexural strength. A significant difference was found both for CR and TP among tested groups. VITA In-Ceram YZ HT and inCoris TZI showed the higher translucency. The difference was not statistically significant when compared with VITA In-Ceram YZ, and statistically significant when compared with IPS e.max Zir-CAD and inCoris ZI. Conclusion: The new {"}augmented translucency{"} TZPs showed higher translucency and similar flexural strength than {"}traditional{"} TZPs. Clinical Significance: Monolithic zirconia use is partially restricted due to the zirconia low translucency. The new {"}augmented translucency{"} zirconia showed a modest but perceptible increase in translucency and a similar flexural resistance, thus increasing the clinically suitable thickness range with optimized aesthetic and resistance.",

author = "Alessandro Vichi and Maurizio Sedda and {Fabian Fonzar}, Riccardo and Michele Carrabba and Marco Ferrari",

note = "Publisher Copyright: {\textcopyright} 2015 Wiley Periodicals, Inc.",

year = "2016",

month = apr,

day = "26",

doi = "10.1111/jerd.12172",

language = "English",

volume = "28",

pages = "S32--S39",

journal = "Journal of Esthetic and Restorative Dentistry",

issn = "1496-4155",

publisher = "Wiley-Blackwell",

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}

Comparison of contrast ratio, translucency parameter, and flexural strength of traditional and "augmented translucency" zirconia for CEREC CAD/CAM system. / Vichi, Alessandro; Sedda, Maurizio; Fabian Fonzar, Riccardo et al.
In: Journal of Esthetic and Restorative Dentistry, Vol. 28, No. S1, 26.04.2016, p. S32-S39.

Research output: Contribution to journal › Article › peer-review

TY - JOUR

T1 - Comparison of contrast ratio, translucency parameter, and flexural strength of traditional and "augmented translucency" zirconia for CEREC CAD/CAM system

AU - Vichi, Alessandro

AU - Sedda, Maurizio

AU - Fabian Fonzar, Riccardo

AU - Carrabba, Michele

AU - Ferrari, Marco

PY - 2016/4/26

Y1 - 2016/4/26

N2 - Purpose: Tetragonal zirconia polycrystals (TZP) can be used via CAD/CAM technique as metal replacement for fixed partial dentures. However, its intense white color and high opacity may represent an aesthetic limit. New TZPs with a claimed higher degree of translucency were recently marketed. The aim of the study was to investigate contrast ratio (CR), translucency parameter (TP), flexural strength (σ), Weibull characteristic strength (σ0), and Weibull modulus (m) of three "traditional" (IPS e.max Zir-CAD, inCoris ZI, VITA In-Ceram YZ) and two "increased translucency" (inCoris TZI, VITA In-Ceram YZ HT) Y-TZPs. Methods: For flexural strength, ISO 6872:2008 was followed. Bars (N = 40) were cut from pre-sintered blocks. Dense-sintering, finishing, and polishing were performed in order to obtain specimens of 15 × 4 × 1.2 mm. Samples were tested with three-point bending setup in a universal testing machine. For CR and TP, specimens (N = 10) were cut perpendicularly to the long axis from pre-sintered blocks. After the dense-sintering, specimens were finished and polished in order to obtain tiles of 12 × 15 × 1 mm. CR and TP were measured with a spectrophotometer equipped with an integrating sphere. Results: No significant difference was found regarding flexural strength. A significant difference was found both for CR and TP among tested groups. VITA In-Ceram YZ HT and inCoris TZI showed the higher translucency. The difference was not statistically significant when compared with VITA In-Ceram YZ, and statistically significant when compared with IPS e.max Zir-CAD and inCoris ZI. Conclusion: The new "augmented translucency" TZPs showed higher translucency and similar flexural strength than "traditional" TZPs. Clinical Significance: Monolithic zirconia use is partially restricted due to the zirconia low translucency. The new "augmented translucency" zirconia showed a modest but perceptible increase in translucency and a similar flexural resistance, thus increasing the clinically suitable thickness range with optimized aesthetic and resistance.

AB - Purpose: Tetragonal zirconia polycrystals (TZP) can be used via CAD/CAM technique as metal replacement for fixed partial dentures. However, its intense white color and high opacity may represent an aesthetic limit. New TZPs with a claimed higher degree of translucency were recently marketed. The aim of the study was to investigate contrast ratio (CR), translucency parameter (TP), flexural strength (σ), Weibull characteristic strength (σ0), and Weibull modulus (m) of three "traditional" (IPS e.max Zir-CAD, inCoris ZI, VITA In-Ceram YZ) and two "increased translucency" (inCoris TZI, VITA In-Ceram YZ HT) Y-TZPs. Methods: For flexural strength, ISO 6872:2008 was followed. Bars (N = 40) were cut from pre-sintered blocks. Dense-sintering, finishing, and polishing were performed in order to obtain specimens of 15 × 4 × 1.2 mm. Samples were tested with three-point bending setup in a universal testing machine. For CR and TP, specimens (N = 10) were cut perpendicularly to the long axis from pre-sintered blocks. After the dense-sintering, specimens were finished and polished in order to obtain tiles of 12 × 15 × 1 mm. CR and TP were measured with a spectrophotometer equipped with an integrating sphere. Results: No significant difference was found regarding flexural strength. A significant difference was found both for CR and TP among tested groups. VITA In-Ceram YZ HT and inCoris TZI showed the higher translucency. The difference was not statistically significant when compared with VITA In-Ceram YZ, and statistically significant when compared with IPS e.max Zir-CAD and inCoris ZI. Conclusion: The new "augmented translucency" TZPs showed higher translucency and similar flexural strength than "traditional" TZPs. Clinical Significance: Monolithic zirconia use is partially restricted due to the zirconia low translucency. The new "augmented translucency" zirconia showed a modest but perceptible increase in translucency and a similar flexural resistance, thus increasing the clinically suitable thickness range with optimized aesthetic and resistance.

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U2 - 10.1111/jerd.12172

DO - 10.1111/jerd.12172

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AN - SCOPUS:84947303468

SN - 1496-4155

VL - 28

SP - S32-S39

JO - Journal of Esthetic and Restorative Dentistry

JF - Journal of Esthetic and Restorative Dentistry

IS - S1

ER -

Comparison of contrast ratio, translucency parameter, and flexural strength of traditional and "augmented translucency" zirconia for CEREC CAD/CAM system

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